So you're looking to add an audio component to your presentations. Epson projectors do not have audio pass-throughs, meaning there is no way to connect audio directly to the projector to play sound. However, it is possible to connect a stereo directly to the same computer or component to which you've hooked up the projector. Then, your audio will sync up with your on-screen presentation without a problem.
Determine what type of audio output you will be working with. If you're using a computer, you will likely need to plug into your headphone port, which is a small, round port called a 3.5mm jack; you will need to continue to the next step. If using a DVD player, you will be using standard RCA audio outputs. These are two round ports, one red, one white, and likely on the back. If this is the case, skip to Step 3.
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Connect a 3.5mm to RCA audio adapter to your headphone jack. This will allow your headphone jack to accommodate RCA audio outputs for connection to your stereo. Insert the long, thin metal end into your headphone jack.
Connect one set of ends on the RCA audio cable to your RCA audio outputs. Make sure to match up the red and white color-coding. Then connect the other set of ends to the audio inputs on your stereo; these will be identical in shape and color.
Set your stereo to receive an input signal from your computer. How this is done varies by stereo, but there are usually various input buttons or an input dial. For more information on this, consult your stereo's manual for specifics on input modes.
Locate the video output on the device you are trying to connect. On a computer, you will be looking for a VGA output, which is a trapezoid-shaped port with a series of pins inside, or a DVI output, which is a rectangular output with an indent in the middle. On a DVD player, you will be looking for an S-Video port, which is a round port with four pins inside.
Connect a video cable to the video output port on your component. For a VGA, push the cable's connector into the computer port until snug, then secure it by twisting the two exterior screws until they are secure as well. For the DVI or the S-Video connectors, simply insert the plugs; they will only fit one way.
Locate the appropriate video input on your Epson projector. This port will be identical to the one you just used on your component. Connect the other end of the cable to this port.
Turn on your projector. Most projectors will automatically determine which input is sending a signal and display that on your screen. If it does not, press the Input or Source button on the projector until your picture appears.
Things You'll Need
RCA audio cables (red/white)
3.5mm to RCA adapter (optional)
VGA video cable (to connect a computer)
S-Video cable (to connect a DVD player)